Willow branch selection by the red-naped sapsucker (<i>Sphyrapicus nuchalis</i>): The effects of branch characteristics on foraging behavior in Gothic, CO
Abstract
Foraging Red-naped sapsuckers (Sphyrapicus nuchalis) displayed a clear preference for interior willow branches branches (80% of all total wells) over exterior branches, and for east-facing branches (62% of all total wells) over west-facing ones. Interior branches were most likely favored because of the protection they offered from predators: this theory was supported with observational data in which sapsuckers foraging on exterior branches scanned their surroundings almost twice as often as on interior branches. By contrast, preference for east-facing branches was most likely related to temperature. East-facing branches gained more heat and stayed significantly warmer than their west- facing counterparts for the time intervals of 7 am to 3 pm. Additionally, 72.2% of all total drill sites were found within in the range of 1.072- 1.875 m along the branch and 48.8% found between the range of .92- 1.32 m above the ground, indicating that sapsuckers preferentially create wells within a very specific set of dimensions.
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